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Assets Held for Sale (Detail) - USD ($)
3 Months Ended 6 Months Ended
Oct. 28, 2018
Oct. 28, 2018
Oct. 29, 2017
Long Lived Assets Held-for-sale [Line Items]      
Proceeds from the sale of equipment   $ 1,280,000 $ 6,000
Gain on sale of equipment   1,079,000  
Assets held for sale $ 237,000 237,000  
Upholstery Fabrics [Member]      
Long Lived Assets Held-for-sale [Line Items]      
Building and equipment classified as held for sale 393,000    
Impairment of assets held for sale 0    
Proceeds from the sale of equipment 1,280,000    
Gain on sale of equipment 1,123,000 1,123,000  
Upholstery Fabrics [Member] | Building and Land [Member]      
Long Lived Assets Held-for-sale [Line Items]      
Assets held for sale $ 237,000 $ 237,000